<template>
   <div>
       <!--面包屑导航区-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
         <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
         <el-breadcrumb-item>权限管理</el-breadcrumb-item>
         <el-breadcrumb-item>角色列表</el-breadcrumb-item>
      </el-breadcrumb>

      <!--卡片视图--> 
      <el-card>
      <!--添加角色按钮区-->
         <el-row>
            <el-col>
               <el-button type="primary">添加角色</el-button>
            </el-col>
         </el-row>

         <!--角色列表区域-->
         <el-table :data="rolelist" border stripe>
         <!--展开列-->
         <el-table-column type="expand">
            <template slot-scope="scope">
              <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                 <!--渲染一级权限-->
                 <el-col :span="5">
                    <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                 </el-col>
                 <!--渲染二级和三级权限-->
                 <el-col :span="19">
                 <!--通过for循环 嵌套渲染二级权限-->
                   <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                       <el-col :span="6">
                          <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                          <i class="el-icon-caret-right"></i>
                       </el-col>
                       <el-col :span="18">
                         <el-tag type="warning" v-for="(item3) in item2.children"
                         :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                       </el-col>
                   </el-row>
                 </el-col>
              </el-row>

            
            </template>
         </el-table-column>
         <!--索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" width="300px">
                <template slot-scope>
                <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog">分配权限</el-button>
                </template>
            </el-table-column>

         </el-table>
      </el-card>

      <!--分配权限的对话框-->
      <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%">
            <!--树形控件-->
            <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all 
            :default-checked-keys="defKeys"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
    </el-dialog>
   </div>
</template>

<script>
    export default {
        data(){
            return {
                //所有角色列表数据
                rolelist: [],
                //控制分配权限对话框的显示与隐藏
                setRightDialogVisible:false,
                //所有权限的数据
                rightslist: [],
                //树形控件的属性绑定对象
                treeProps:{
                    label: 'authName',
                    children:'children'
                },
                //默认选中的节点Id值数组
                defKeys: []
            }
        },
        created() {
            this.getRolesList()
        },
        methods:{
            //获取所有角色的列表
            async getRolesList() {
                const {data: res} = await this.$http.get('roles')

                if(res.meta.status !== 200){
                    return this.$message.error('获取角色列表失败')
                }

                this.rolelist = res.data


            },
            //根据ID删除对应的权限
            async removeRightById(role, rightId){
                //弹框提示用户是否要删除
                const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                    }).catch(err => err)

                    if(confirmResult != 'confirm'){
                        return this.$message.info('取消了删除！')
                    }
              const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

              if(res.meta.status !== 200){
                  return this.$message.error('删除权限失败!')
              }

              role.children = res.data
            },
            //展示分配权限的对话框
            async showSetRightDialog(role){
                //获取所有权限的数据
                const { data: res} = await this.$http.get('rights/tree')

                if(res.meta.status!==200){
                    return this.$message.error('获取权限数据失败！')
                }
                
                //把获取到的权限数据保存到data中
                this.rightslist = res.data
                console.log(this.rightslist)

                 //递归获取三级节点的id
                this.getLeafKeys(role,this.defKeys)

                this.setRightDialogVisible = true


            },
            //通过递归的形式，获取角色下所有三级权限的id,并保存到defKeys 数组中
            getLeafKeys(node,arr) {
                // 如果当前 Node 节点不包含children属性，则是三级节点
                if(!node.children){
                    return arr.push(node.id)
                }

                node.children.forEach(item => this.getLeafKeys(item, arr))
            },
            setRightDialogClosed(){
                this.defKeys = []
            },
            //点击为角色分配权限
            allotRights(){
                const keys = [
                    ...this.$refs.treeRef.getCheckedKeys(),
                    ...this.$refs.treeRef.getHalfCheckedKeys()
                ]

                console.log(keys)
            }
        }
    }
</script>

<style lang="less" scoped>
.el-tag{
    margin: 7px;
}

.bdtop {
    border-top:1px solid #eee;
}

.bdbottom {
    border-bottom: 1px solid #eee;
}

.vcenter {
    display: flex;
    align-items: center;
}


</style>